Arrow keys or WASD to move. Press the zero key to open and close the editor. Keymap (when you're in the editor): 1 to toggle between wood blocks, 2 to toggle between the gold block and on wood-ish block, 3 to toggle between blue platforms. If you are in editor mode, you can fly around and go through blocks.
1% by me :P 99% @griffpatch_tutor
